There are several opportunities when you have to cope up with several errors. The occurrence of WordPress Error 404 makes it irritating enough for users. The error code defines the issue when the server cant find pages or posts on your website. An unexpected error occurs due to different small or critical changes in your WordPress website. You can easily resolve this error by permanently fixing the permalink errors: Save Permalinks And Manually reset Permalinks.
Manually setting of permalinks depend upon various situations, and different actions needed according to the following conditions:
If your site is in the same domain
When your site is in subdomain
When a website is in sub directly
To get more explanation on the steps to fix errors, you can visit the official WordPress forum. The permalinks structure can be changed from the WordPress dashboard depending upon your choice.